That's Lee Moon Young from the manhwa "Girls of the Wild's". She's not the main character or the romantic lead but she does kick ass. It's about a weak, bullied guy who ends up as the only male in a special, newly co-ed school for training martial artists. Super cliche, yes, but also really, really good and the art is amazing. http://www.batoto.net/comic/_/comics/girls-of-the-wilds-r1021
That's Queen, the best of the best.
Lee Moon Young and Choi Dal Dal.
Edit: Bonus Dal Dal because she deserves it.